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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e0ad17f0ccba013f22d0a7714dd342ee2354aeb3795d312680bb483a0577e3' 
  AND token = 'JbDZ63deUiwN3K0HPzxnEz8cANF7Whs6IB2cbVENUg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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