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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f81afe7299dc2c5ea33304c9e55d68ac1e1c87091fdfa5b1d29da648080d452' 
  AND token = 'RL2Zs4tQF4d957JPPzu8cUWo8LEgy8QtKS6hdbTz3BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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