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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b76f430984b42dd0f5fc35063a50a588577c32f27ac34861931a87179f12e34' 
  AND token = 'rPx9Utax7eC+9QToHLTbu7txd/HJzCVWCEX9QKLubm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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