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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b02d7e7aa63bec44c5a346246625b28ba6ec4b2133e93845ddeec0022f48c39' 
  AND token = '2sF72zjqAu89Xzsm4Tp2iFnxoMA6DWS6xKKHLLIY/48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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