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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7d9ed863d8542a649e2048b3708e892a9d024caaaf485d2292c465aeba21ff' 
  AND token = 'qkWidxP5Gf8bWTK5K4b7ChfgY6iWWyI46ao98oFhHgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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