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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9944ba405a77395a01d81abac422f3f0a1860e24c8c727b862bd67a1be6c4234' 
  AND token = 'VqgLZireBv1pbis3pCL52r/GesyC0WrK+uiOIedH6H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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