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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a92faebfb7c968e5e62156d8d14f62155ab3b46008cff3ff12549c3e5744f2' 
  AND token = 'bePQvMDbPeOG5RNiP82HWpa689I8PpkWBJelLQFcGSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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