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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c8387503aaae591473bb0d262416dee7716cb0c08b9a1a5b960b4558e9ba8f' 
  AND token = 'XxDzi1HTxN6q8uCYtTE3wG8cBDuRzgyMalNZqKShU8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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