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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6c5d59439db7cbde0cc26c2b816ef2543791a58055f500f9fadde865a40bc9' 
  AND token = 'qHVZV4gDOz5GyOMcvSYQ0GcBMsQr+R10qP88Y5CAjE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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