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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e247d33da48adbde69faae1000ffaa699ac5bf27407b4c2f472bd88c653b373' 
  AND token = 'wokmALRQAyMmCrBhHEsk4u2ngm/duTdu/k/B9TQfQHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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