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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6743ee94b2ee876a3de03beea4c9444120bf0ff89cafa363c1376e02b768b594' 
  AND token = '2dedtAJN6SEAbABIMmXo5elVV7q19V9NRYmfZngj8Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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