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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1d6ba49cd330c4bd5e3d3988c46523a0c838683eadcff54503d9edac4ce494' 
  AND token = '6ABQKC3cgH3/7uPeyqGyyUE6cWwEsGLFWbgeOa6zhKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}