SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169fac585529498f750c85933b0717d53d002cc85cfb3ca0b29b8ee2cbe28244' 
  AND token = 'ANHPfAld6LwGIrsseRmBlvYnlKV/OTSesClxHDnV+gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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