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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37f64c3f48e30ab9e1178b006cf4f4f2a0490277d149c3a44a9c30e2a159181' 
  AND token = 'wCdAgYBlR6O4dEra1Xx7Sa1iceFJMJhjewbiy00YwFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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