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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f72eb80aa799e56695874d41cfb2b87cbc50c89610e4f4fac41e0730fa5c90' 
  AND token = 'FfaM0T0KADKqIHoND5v9QcADNlD3Q/8K/BxjvaAOmhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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