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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1decd0bae77113049be41742e1789699c6595cf7bdb6538e554e16b2fc2834' 
  AND token = 'hIzIjNT6qLQa5OeL3wAhUh7vdMNuBi4XMUfqgUt5KJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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