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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf920fd77df92001aa3c8fc628ddae9dc3666ff85782ac57ec0b5cc7bd122d6' 
  AND token = '+T1dV+pykZUMDFKbg7oAc77dI0lzwws+T4YlAkkGD7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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