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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b02fa42d19dfca74e413a5bc82404540852c3d3e5fe65a8daca93d406a32040' 
  AND token = '9oLy7mT7finNqkYxixGbrhW5YK8aAQ1qdgajHlYN0P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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