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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f3a57e99cd7d5726875357c83d25059c573812a045d844a7d3d6e445998649' 
  AND token = 'AaXwHFGwtcMNLfr0ouDENEWvfkEdVQGZw2ncMuy6Vu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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