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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '349ef882bbff0549e19c01e98884411ef9a9cc03cba01f5de43701aa8cf99816' 
  AND token = 'as/T4+BKefggtgXMEB9hn0c9yXse+tne3E4Uab7/bqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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