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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faba2bba08f63535a599d0f808e7d8d131412b84d9d03554d457d2b5648dc49b' 
  AND token = '7ys+rZLucUtX0EjLJHXaP0wlvVstb2lmaEOct4b7+gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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