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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3604b90d60e6ea0575fb46d9e29e8e2bbeaebc8e14576cf86ffc30dcf3d5bb3' 
  AND token = 'BIAXvosP/UAC7p7ZzubJ5NIolKB+FH9Uze8TnUC8DCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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