SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0a96374b24ac447035f881ad6478f64f9b4a9d83a6ec97b8c231ba06bfafee' 
  AND token = 'w4oINIJjKkPH+ETRwzbXrnr3AmYs/AKgan3WhFUZg3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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