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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ead8df70fad028c4b6be786a24375d4a22676ab575e2f65886108f54f416a68' 
  AND token = 'QFUEcT6nSK8+W5UXBenTGc+t97fjAM9bXWIapX0pE/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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