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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99019ed6267c81489975b98600dba84213130a6d4f324e75323ce777571b9c64' 
  AND token = 'IukQmJ4IF1raVuxHIs4WI+0jlDVzdetkXHEYpJL3ngs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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