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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e730329dd073bdf942615c98beb6dfe9221d86cb6e6d626e5b6decbc96a8ad' 
  AND token = 'ExOBdUX9nLAQ8YlA7tDZYnA9HO8VH7lGYsJh0h51L8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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