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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139bbbf6695f66b8b611c9df3861695889b1b1d720070b0fbf394f24147d1283' 
  AND token = 'WdmQg+8KVt4iw34M+PQiyMEXxNXKvnuuRo5ODrt6B3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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