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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1caba5bdd59d1dbc5dcf9ddd97ff88733e8febffa5100c27770b38469c6a394b' 
  AND token = '73X62sUd4fzoaXRO6xmpthu15A6x2mJBQAHNSYc4lYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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