SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5aca06f4bebe64f3457a239b4cd790f6882c23b1563f31525e327cadd6d0d40' 
  AND token = 'rZVSWqY2yhbr/f/4s2+YHwzQuJQRqDKHKKAEAC4RGVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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