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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c526c94306d344276e7c15655486efb8ffcccdb7073019b4bf09d2a2ffac73ec' 
  AND token = 'DDfLSsRYcMiarog2HEow6mXPoKLGZinVCGR3W9jXDm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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