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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299b7d6a9ece9cc7e1936fe8bda455524aa49afd0218f2b6b0202d72710612c4' 
  AND token = 'YnKD1KODtePz3XU6FR5zTPWI/M9dCjG0kMS5opbCsqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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