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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07907b65e280881bcf3c62d9c796e3e6b388f142ffb158ed819f4cb2d647bcb5' 
  AND token = 'SlMwph7Gmj5uI9Wr3Onnl1QkR41OFDcCBkbVVXwMIpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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