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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2bd333f726bc82b7f374215f53d031588931ab789f6db4efbc9f698349597e' 
  AND token = '0bru2NlNDV97bjg9HMWWGchJOSIl4JQ14BtbYBkjHQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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