SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65ddff11228ca997fcb8dd7c007f2096f48f26cfc2a87891566ed9072599d23' 
  AND token = 'mpngV/Hwiw1Q6mz5oLvO1/KIZDSJnaR2twt/r3rPaHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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