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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c18656c1a76edc6c9f79be321ef8d54c46aee877bc5d85bdc8396c659f5ed4b8' 
  AND token = 'QQE2k+WElxikalKSzkVqAf3vXd50NVgVP7vX9xpX7m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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