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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a59df4943432aa37a906c008375460a87ca1cc9dba594da83da02af15a3b1e0' 
  AND token = 'ge3twGswZIyoZYK3ivT5evEueY6ghdR3usr7uimpLzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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