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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39816e0ea798acb7462ae732d56c1f0882624637d095cca2b374b8ace6144ef' 
  AND token = 'c960kXfJASN6oxonrLq3B/YKFrPfL3W8pJXtQU1uYCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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