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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35132db11205636c0ca3a4516b484ff3fa97e2bbe7156b83c8d04b683242ee72' 
  AND token = 'Yzy96IHrDwpRWAFpbboX6M6cGxyda+ohPywlKmpjAII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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