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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88dde30435ea65867384123a2215966432ee980b29ab6387d3047192ac01557e' 
  AND token = 'e3s8XwFz1AhEJkSEDlGyajlsNG10zS4V538XKO5F+/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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