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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ec595256a8cfaeb268756c8ef8442d1bc5094dc87c38e93543949254e0131f' 
  AND token = 'qE0oJ73/zBneEqHkZBDkXFuqyBB4bRkRUrl3A2CD4/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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