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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b174f21b2c4e9c352ae128fada2966c95653c1bd60b2f0d2732793276a372cb5' 
  AND token = '2EJRu2s7eKkfUxSvQnriD9WEyZxJgXB8fXJ/w7qPIro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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