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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14484fc3e0f304db271177e0decbffad1f97491105296acbae92bc6d3170d9b' 
  AND token = 'BT+bp/Q2P1pKnA5zNdcKDKECqCPlYGIxdHrErM7k5kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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