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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce56009ee8e56801e75c42ffd19c82b4ef7302668ae260c7c7a503811c7ff76' 
  AND token = 'AsghSllKmreck5UcfqjY6KWBiZ/8VgROTNHKIDZZ3b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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