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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822dff9c165eceb368f72abefd5712f3b214c9fd020012bdd2fe8addb491a45f' 
  AND token = 'Pc5InB/czJu8bndECXyPRpkf6pTBW91qoxSEvCkI1pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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