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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6353beefdbfadf7c838dda9e87e634e7e86249310d21bff6c66151adeec6e2' 
  AND token = 'qFyxY7wqCleXHTv+P27RNc24z00Ljo+pj9IzyphK3CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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