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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f97f0668752be820a06bb596cf278a08c74965bb1233ebb7b648ab8d9fdff64' 
  AND token = '9omixdo+3xRPNrdUWgdm/THmSkbZqrzukyOFhEdlLOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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