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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d8695a86110f3ba14e2ea3803502fdc474a314ba9ae5dcf4e026b1266f4258' 
  AND token = 'bIufRDOiR19oRVRPqJNifM0BRIMQnuG2lvX2um9q5Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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