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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01c08ec3d2e842d04a3feaaf8198ec72655e7987d8ac976b48108a61e6ae1f1' 
  AND token = 'sghBXTdNoAP+iP/WqgHQP0T2FP84aEPk2H0h8WlmZtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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