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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc04d84b3526d934de12f8f2fdadd9a1862225d2cc6444d8776ea604598f722' 
  AND token = '5qLdpR6vKMN6P5Hy0q4nDRZITrcdXVzJhHcdjDrEI8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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