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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89549a9169f091ad6157bea36ebac7fb8a4dba47ac00edd2773d7601b90dfce' 
  AND token = 'pqZtLg45bU6KCZbuqSICHf2XTNkMJXamuLxD1GBHHTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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