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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f3b3ef11eacf8e3ae31d0c03c1a9a587ecca8550b2d019b806d9d8b8a8918b' 
  AND token = 'JZJse3kui234LV8Tw2RW67pJQG1NBRDGHzDJo6x5PrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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