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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61cc8196e569b4a1fc64c380250f4d6214198bb8278471050c5292b3b31abad' 
  AND token = 'kOoQtjpEik6WCzh225p8U2pCH8YqQYOVr/OfR20RZtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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