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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a923925c92b57ffcd5caa63acc6c0a8e959e5da6aba224c76200c8c9a7377ed5' 
  AND token = 'Os+FkNr4lBBYW2bTXwaBil/5AJAJ6h8qIO7fvl8UOzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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