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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6f7adbbc777f9ff006765fc727a1760b4b29729a67ae5154cd599e99befea5' 
  AND token = 'IqOyq0CXp2P8DEHk/c428YXjFj13jbdQAEWsh83i878=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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