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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab13f7bb0fc44c34d1527dd3a6a914752ae20139ed7d8950cb6f37679ff1d0a' 
  AND token = '5Zd8DmDiSNW3P5YATs50V9FWl5XdgdZaNDnjg0Hcddc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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