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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd831757c4ab06cda6b4eb4842ae353a187c4bf2342348a2415241e2c2b82c838' 
  AND token = 'MqQWEzw36qy+8WQvUbiG++oqN15CQgScEi7b0QbGijo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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