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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da326f3589f6dd9e672dd472e06b06ed3d8d250947769c84ad6ead34e42fa1c' 
  AND token = 'pCWsYUKJ9cUj1vUXefcxkFc9WscveLuKcM5nxrvy53M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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