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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5cccb1fb73f536dfd82e5293ef172a7d68899163da70a00c27751cd704b606' 
  AND token = 'dSR+IYsIhVfHlMizL6de10TnS6B78HSRKVqkZUqChRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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