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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80bb7b433fba016fddf77711f02a022ee3fb83ba70b25949c480c2d681099bbf' 
  AND token = 'BvdEZMYxBe6VWGH5lRJKN6Mzfs8XOgK90viP0VAub3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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