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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885d1c979e0dcf9e2395489518351ba4231c15454d4b565fe81e949987103ff1' 
  AND token = 'F+AhqxCzZCkFltITnNkiGH0N5vJfIo5E/4xB8D5v/og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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