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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55842e99e4e3984382dc275f97d35f11a62d4d7bff3641ad555ba6ec895d32a' 
  AND token = 'odAjLkhSgszsCm85UJKsOQ9vfiFLec5G6fFQj+uoQWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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