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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027476be8974883a199d6626f1d499f5dfd6ecfb96f23ca708fa04e467625fd7' 
  AND token = 'aRbnho6H6q5jIDZdURFQ5SzU4t/TH8HA5Gt0HxnE19k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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