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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fc017b02b1d2a61fb4f403ee1dad20cc6da9b513d15ee5e2ee9d485799e374' 
  AND token = 'Deqokvi6BgPPY4ohl7gDYgj/ruxXRlXBwj1GM12j3uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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