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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78378f2bdfeb4509661ff33b5a6dc33d510ba7b4bf049b960e2ee2834e0674a8' 
  AND token = 'SN5kxqF6WR6EBcRMOmOha+/+1kASfNNkEng0QLPM3kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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