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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd3fed16b08ce8286a92b70ff45a14502747fdd0377ba7ca7f505e0bbe0fcc2' 
  AND token = 'TgvlhFH1RcnhcVWhW2mZlWct9ReyrCE/nHJ29HUOe2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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