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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5410acaa1e1c3ff00c250a8691dc6dd3df3ef15574088d62762a8177441208ce' 
  AND token = 'g3otVkVbQzcgG+Bn/xDoGQWefJAqLZYUiY3d/YaY0Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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