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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95505f12de6b695a99bf05395ad02ce18e47c29f26f23741f36b7ea98fbd6d4d' 
  AND token = '9oiZd2WASt8MBGuC11QurrL5MDHWLYLNOCOm/1gxoNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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