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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5164c44e5f7751b539fff958ffde019188dd90238ff2277b591708cc2b87b5' 
  AND token = '0h2I4mVIx4Ys4+INbmGjz9XDf6Ub1mJaHT9C5I6qArA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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