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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e19d757e87a812d08e4fcfc6419feb14d02dce4fa79a326fcf26d7d751f38cb' 
  AND token = 'EvStxpIJ1XxkMxb/XgvsExFzppbdabdI4dUfJNfIDs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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