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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3548c232f345549cd2b01af8484e2a00e5e897d33672dada02e4ed9c86bb8b2' 
  AND token = 'ieqee/uar/2Sb5SsO9EpBAZXLxvyTMPrQVer5sgLAWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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