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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435cb23cdf892b9b3721fb7f0fc0a6da9156949acd87ab55b58c70118ed97c94' 
  AND token = '9iXQKLnSDWkC0PxWpgHxfAvxTGx3r6IWn8F2F/Ie+Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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