SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b26343d0b114c8aa66c1a9f07c5237cc27b8fc36bc39054a778bd69e1b78f0b' 
  AND token = '9NSr4Wz+b7E8wjs4vIEf4ZRGpVmNLpmYBjsYYspjJQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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