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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110d0aa0339c7b1ada23a6e8e7463c0f0b3df0d14404c10ff2539259461ebe8e' 
  AND token = '9EZsZBugUhlYhCHEWfun0TofzLwgc1LXdPbgjDaX7e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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