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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc2a962d001ebdb323b88d482fbda36a585c5d038ee807781a6289f76ff02f3' 
  AND token = 'J1JXaXXS46gQ6HmMFbjOtlTMdaLihnyDQ+MozxJhQ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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